di·the·ism \ˈdīthēˌizəm, (ˈ)dīˈth-\noun (-s) Etymology:di- + -theism : belief in or theory of the existence of two gods or of two original principles, one good and one evil (as in Manichaeism) • di·the·is·tic\|dīthēˈistik\ordi·the·is·ti·cal\-stə̇kəl\adjective